Question

To sustain good health, __________ important to follow a healthful diet. (Points : 1)
its
its'
it's

Answer 1

The form "its" is a possessive pronoun, just like these: my, your, his, her, our, their. And these: mine, yours, his, hers, ours, theirs.

The form "it's" equals either "it is" or "it has."

There is no form "its'" with the plural apostrophe.

Given this info, which do you think is the correct answer?